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    A New Load Detection Method and Circuit Analysis for Quasi Resonant Inverter
    (IEEE, 2021) Zungor, Fatih; Emre, Burhaneddin; Oz, Baris; Öztürk, Metin
    Induction Heating (III) technology is very popular in-home usage due to its safety, efficiency, and fast heating advantages. Although common induction heaters are designed to heat ferromagnetic pans, it is not easy to determine load conditions in every working condition. Because of the relationship between inverter circuit parameters and induction loads, load identification methods are very critical in induction hob applications. On the other hand, circuit elements (e.g., capacitor, inductor, frequency, etc.) are very important not only for the accurate power control but also reliability to design an induction hob. This study focuses on a new load detection method based on circuit analysis for quasi resonant induction hobs. Proposed method is theoretically examined and proven by the help of simulations and prototyped circuit.
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    Design Methodology of Series Resonant Half Bridge Inverter for Induction Cooker
    (Ieee-Inst Electrical Electronics Engineers Inc, 2023) Zungor, Fatih; Bodur, Haci; Öztürk, Metin; Obdan, Hulya
    Induction heating is a commonly used method of heating in household appliances due to its efficiency and high reliability. In induction cookers, resonant inverter circuits are frequently chosen due to their high efficiency and the ability to facilitate soft switching. Among the resonant inverters used in induction cookers, the half-bridge series resonant (HBSR) inverter topology is often preferred for applications where a balance between cost and power is required. Despite the numerous circuit designs proposed to enhance the performance of HBSR converters, a standardized design methodology suitable for circuit design dedicated to induction cookers has not yet been established. In this study, a new HBSR inverter design methodology supported by various theoretical equations is proposed for use in household induction cooktops. In the proposed design, the first step involves calculating the equivalent resistance value of the coil. Subsequently, a coil capable of achieving this resistance value is mechanically designed. Finally, the capacitance value for the resonance circuit is calculated. In particular, calculating the equivalent resistance value before designing the coil enables the practical implementation of a viable coil design. To validate the proposed design methodology, controlling the power transferred to the resonant circuit is necessary. For this purpose, the frequency modulation technique achieves closed-loop power control using the peak value of coil current. Additionally, it also needs to be proven that the implementation circuit works with soft switching between the maximum and minimum switch cut-off currents. To assess the compliance of the proposed design method with standards, thermal measurements were taken from semiconductors, EMC measurements were conducted to verify compliance with the IEC 55014-1 standard, and finally, the power transferred to the resonant circuit was calculated using oscilloscope measurements. Using the proposed design method, calculations were performed for a 20 cm diameter iron pot with a 2300 VA power transfer at 230 VAC mains voltage. Subsequently, these calculations were verified using various simulation tools, and finally, a prototype implementation circuit was realized to demonstrate the reliability of the proposed design method.
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    Implementation of Forward Converter with Active Clamp for Welding Machines
    (Institute of Electrical and Electronics Engineers Inc., 2021) Zungor, Fatih; Bilicioglu, M. Faruk; Kavak, Enes; Eski, Ibrahim; Öztürk, Metin; Bodur, Haci
    Among the converters used in welding machines, two-switch forward converter has an important place in low and medium power applications for cost priority applications. However, one of the most important disadvantage of this converter is limited duty cycle, which is less than 50%. Therefore, the capacitors used for shaping the main line voltage occupy an important place on the circuit. Another disadvantage of the converter is that the transformer uses the B-H curve unidirectional way. This causes the transformer to be selected larger when compared to other converters for the same power value. In this study, it has been suggested use forward converter with active clamp to which provides using the B-H curve bidirectional way with clamp capacitor, extending duty cycle more than %50 and increasing power density solve these disadvantages of two switch forward converter for welding machines. For this purpose, a converter with 230V input; 25V/150A and 3750W output will be designed and simulated to show that the converter solves the mentioned disadvantages. © 2021 IEEE.
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    Öğe
    Quasi Resonant Inverter Load Recognition Method
    (Ieee-Inst Electrical Electronics Engineers Inc, 2022) Öztürk, Metin; Zungor, Fatih; Emre, Burhaneddin; Oz, Baris
    Induction heating (IH) technology is very popular in domestic applications because of its efficiency and safe operating properties. Resonant inverter circuits are widely used in IH systems owing to their high efficiency and soft-switching capability. Among the resonant inverters used in IH systems, the single-switch quasi-resonant inverter topology is generally preferred for low-cost and low-output-power applications. Despite the low-cost advantage of the quasi-resonant inverter, the soft-switching range is quite narrow, and it is not stable depending on the electrical parameters of the load that is desired to be heated. In other words, there is a critical relationship between the electrical characteristics of the pan, turn-on, and turn-off times, which are the control parameters of the semiconductor switch, and the safe working conditions. In addition, when the importance of closed-loop control methods is evaluated together with the selection of resonant circuit elements, it is essential to determine whether the load is suitable for heating, and to determine the electrical properties of the load to provide both reliable and efficient operating conditions. This study focuses on a new load-detection method based on circuit analysis for quasi-resonant induction hobs. After determining the load parameters, the turn-on and turn-off times of the semiconductor switch were determined to obtain the lowest possible switching loss. Therefore, the boundary conditions of the semiconductor switch are maintained within these limits. The proposed method and its advantages for the switch safe operating area were theoretically examined and proved through simulations and prototype circuits.